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Re: about study hbase source - HBase - [mail # user]
...You can pick a random JIRA, starting with the ones that seem easy (esp. noob label, but people may not set it on all easy jiras), and submit a patch. The best way to learn the codebase is to...
   Author: Sergey Shelukhin, 2014-01-10, 17:27
[HBASE-10242] client-side mvcc tracking in scanners - HBase - [issue]
...Scanners should be able to track mvcc read point and send it to server. This is a subtask, so server can use this mvcc as best it can, but doesn't actually have to guarantee it within the sc...
http://issues.apache.org/jira/browse/HBASE-10242    Author: Sergey Shelukhin, 2014-01-10, 04:42
[HBASE-10210] during master startup, RS can be you-are-dead-ed by master in error - HBase - [issue]
...Not sure of the root cause yet, I am at "how did this ever work" stage.We see this problem in 0.96.1, but didn't in 0.96.0 + some patches.It looks like RS information arriving from 2 sources...
http://issues.apache.org/jira/browse/HBASE-10210    Author: Sergey Shelukhin, 2014-01-07, 22:16
[HBASE-10241] implement mvcc-consistent scanners (across recovery) - HBase - [issue]
...Scanners currently use mvcc for consistency. However, mvcc is lost on server restart, or even a region move. This JIRA is to enable the scanners to transfer mvcc (or seqId, or some other num...
http://issues.apache.org/jira/browse/HBASE-10241    Author: Sergey Shelukhin, 2014-01-07, 02:23
[expand - 1 more] - Re: multi() contract or lack thereof - HBase - [mail # dev]
...The index is always with respect to the original list on client; server just sends it back. Actually, nevermind, I noticed for each action what I said is not true. Non-atomic ops can reorder...
   Author: Sergey Shelukhin, 2014-01-06, 23:55
[HBASE-10244] store mvcc in store files per KV for longer time, discard during compactions based on scanner timeout - HBase - [issue]
...Initially, we can store via KV tag. For perf reasons, it might make sense to make it a first-class member of KV, but that would require HFileV4...
http://issues.apache.org/jira/browse/HBASE-10244    Author: Sergey Shelukhin, 2014-01-06, 22:37
Re: Committing bug and test fixes to branches - HBase - [mail # dev]
...I think there can be problems with features like mvcc-seqId combo being in a branch, because they may touch lots of places in the core that might change frequently and cause lots of merging/...
   Author: Sergey Shelukhin, 2014-01-06, 17:04
[expand - 1 more] - Re: Performance between HBaseClient scan and HFileReaderV2 - HBase - [mail # user]
...Er, using MR over snapshots, which reads files directly... https://issues.apache.org/jira/browse/HBASE-8369 However, it was only committed to 98. There was interest in 94 port (HBASE-10076),...
   Author: Sergey Shelukhin, 2014-01-02, 21:43
[HBASE-10243] store mvcc in WAL - HBase - [issue]
...mvcc needs to be stored in WAL. Right now seqId is already stored, so if they are combined, it would be removed or deprecated. Might also happen before this jira....
http://issues.apache.org/jira/browse/HBASE-10243    Author: Sergey Shelukhin, 2014-01-02, 18:22
[HBASE-10175] 2-thread ChaosMonkey steps on its own toes - HBase - [issue]
...ChaosMonkey with one destructive and one volatility (flush-compact-split-etc.) threads steps on its own toes and logs a lot of exceptions.A simple solution would be to catch most (or all), l...
http://issues.apache.org/jira/browse/HBASE-10175    Author: Sergey Shelukhin, 2013-12-29, 03:19
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